Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92b21ce4e4696131e9099cfe21563d7049247b3991a3c174b0e7a8748d4b6a8f' 
  AND token = 'HKPKQgj83l/4InTeEU9iOSdMZJp3uIxT417OoZf7IR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}